Device for polishing locomotive crankpins



14} H. E. KLINGLESMITH 2,382,642 DEVICE FOR POLISHING LOCOIOTIVE CRANK PINS 7 Filed Aug. 24, 1943 l Aka/EYE: .KLINGLESMlTl-i,

ENTOIQ.

rrOEQVEY.

Patented Aug. 14, 1945 DEVICE FOR POLISHING LOCOMOTIVE CRANKPINS Henry E. Klinglesmith, Los Angeles, Calif.

Application'August 24, 1943, Serial No. 499,765

21 Claims.

This invention relates to a device for polishing locomotive crank-pins.

After locomotive crank pins have been cut; or machined by a crank pin cutting or turning machine, regardless of the condition of the machine or of the skill of the operator, the bearing surface Of the pin is left in a roughened condition. Hence it is necesary, in order to prepare the crank pin for satisfactory use, to follow the machining thereof with a polishing and smoothing operation in order to remove all high spots and irregularities and cause the pin to have a uniform bearing surface.

Heretofore it-has been common practice, after the machining of the crank pin has been completed, to follow this by hand filing and hand polishing. Such manually performed efforts have required a great deal of time and have not resulted in furnishing the crank pins with satisfactory bearing surfaces.

It is the purpose of this invention toprovide an improved means for mechanically performing the above mentioned polishing and. smoothing operation.

More specifically speaking, among the objects of the invention are: to provide an improved mechanically drivenpolishing device whereby the polishing elements are supported in aproperly tensioned, more readily adjustable manner; to provide rotatable polishing means which will, in a more satisfactory manner, automatically accommodate itself to surface irregularities of the crank pin being polished; to provide a simplified mounting means for the polishing means; and, in particular, to provide an improved means-for replaceably securing strips of abrasive material to a rotary support or carrier, in a'position to efiioiently perform the polishing operation.

Additional specific important objects of the invention are: to provide an improved means, attachable to the crank pin to be polished, to rotatably support the polishing device with its axis of rotation in true axial alinement with the axis of the crank pin; to provide for supporting the polishing assembly between spring arms which are adjustable toward and from each other in order to accommodate the polishing elements carried by them to crank pins of different sizes; to provide for the abrasive elements an improved holding means which automatically adjusts itself to the surface of the crank pin; and to provide for the supporting of the polishing elements in such a manner as to afford to the operator a practically unobstructed view of the surface of the crank pin being polished so that he will know when the polishing operation is complete.

Other objects, advantages andfeatures of vention will hereinafter appear.

Referring to the accompanying drawing, which illustrates what is at present deemed to be a preferred embodiment of the invention,

Fig. 1 is a view, partly in side elevation and partly in vertical midsection, showing the device in its operative polishing relation to a locomotive crank pin, a portion of the latter being broken away to contractthe view. Also, afragment only of the driving means i shown, being phantomally indicated, by broken lines.

Fig. 2 is a section on line 22 of Fig. 1.

Fig. 3 is a section on an enlarged scale, the plane of section being indicated on Fig. 1 by the angular line i i-:3. I

Fig. 4 is a fragmental perspective, on the same scale as Fig. 3, wherein isshown a part of the means for attaching a strip of abrasive material to the device.

Fig. 5 is a fragmental perspective, on the same scale as Fig. 3, to afford additional illustration of a detail of the means for clamping in place the forward'endof each abrasive strip.

Referring in detail to the drawing, and more particularly to Fig. 1, the tubular body 1 carries at its driven end a spindle-like extensionB, having at its outerend aconventio-nal, flattened key, whereby the polisher is driven by the driving member 10 ,of acompressed airlmotor. Said tubular body 1 carriesat its inner end, preferably integral therewith, a head consisting. of a circular web I I surrounded by an annular rim l2.

In Figs. 1 and 3 the device is shown in its operative relation to a locomotive crank pin I5 which has theusual diametrically contracted axial end portion 16. Inaxial alinement with saidfi'crank pin is shown ,a' guide bar I! which 'haslwelded to its inner end a cup-shaped head or socket portion l8 fitted over the crank pin extension or contracted end portion l6 and removably secured :theretoby aset screw IS. The diameter of 'said guidebar H is somewhat less than the internal diameter of the tubular body," and said guide bar isaxially held therein in a-working fit relation thereto by means of a sleeve or bushing 20.

To diametrically opposite sidesof the rim I2 are welded or otherwise secured end portions of oppositely disposed spring metal arms 2|, each of these arms carrying one member of a pair of arcuate frame members 22 which cooperate to may be utilized as polishing elements.

form opposite side portions of an annular frame to surround the crank pin to be polished.

Each of two attaching bolts 25 has an outwardly projecting portion around. which is coiled a compression spring 26 surmounted by a washer 21 against which bears a nut 28 screwed onto said bolt. Through the midwidth portion of each arcuate frame member 22 at its midlength extends a bolt hole 30 through which one of said bolts 25 passes with a clearance therearound. Also, an arcuated countersink 3| is formed in the convex side of the frame member 22, in a concentric relation to the bolt hole 30, within which seats the convex side of a planoconvex ball. joint ring 32 and said frame member 22 has a pair of external guide ears 33 located adjacent to opposite sides of the spring arm 2 I, to limit the lateral movement of the parts carried by said spring arm in relation thereto. By the construction which has just been described each arcuate frame member 22 is fastened in a secure but somewhat flexible manner to the arm 2| by which it is carried, and by substantially a ball joint connection which provides for a slight universal movement of each arcuate frame piece 22 in relation to its supporting arm 2|.

Each of the twin arcuate frame pieces 22 extends through considerably less than a semicircle and has at each end a radially projecting apertured ear 35, thus providing for passing bolts 38 through the oppositely disposed ears at each side of the applied device. A compression spring 31 is coiled around that portion of each of these bolts which bridges the gap between the ears at its side of the device. In Fig. 3 the bolt 36 at the right side of the device is shown with its head directed upwardly and the bolt at the left side with its head directed downwardly, in each case the inner side of the head of the bolt abutting against the outer side of one of the ears. Also, each bolt has a screwthreaded end portion which projects a considerable distance beyond that ear which is farthest from the head of the bolt, and this projecting portion of the boltis surrounded by a compression spring 38, against the outer end of which abuts a washer 39 which is urged against the spring by means of a tensioning nut 40.

The arrangement of bolts and springs which has been described maintains the two arcuate frame pieces 22 in an adjustably tensioned and cushioned relation to the crank pin being operated upon, so that the polishing and abraiding means carried by said frame pieces are yieldingly applied to the crank pin under the desired predetermined pressures.

Emery cloth strips 4| mounted in an interiorly spaced parallel relation to the frame pieces 22 Two of i tive positions.

these strips are shown each having at one end an outwardly directed end portion 42 which is gripped between blocks 43 and 44. Into the block 43 is screwed a short cap screw 45, and into the block 44 screws a like cap screw 46, short slots 41 and 48, which extend lengthwise of the frame pieces, being provided for the respective cap screws 45 and 4B. A Washer 49 is shown underlying the head of each cap screw 46.

Adjacent to the slot 48 the end portion of each frame piece 22 has an interior projection 50 provided with a beveled face 5| againstwhich a correspondingly beveled end of block 44 is abuttable. The blocks 43 and 44 are made slightly arcuate as to their lengths and respectively have ribs 52, 53 along the midwidth of their outer faces, these ribs fitting slidably within a longitudinal groove 54 along the midwidth of the concave face of each frame piece 22.

Corresponding to the adjustable block 43 a like adjustable block 55 having a rib 56 is mounted near the opposite end of each frame piece 22, the latter block having screwed into it a cap screw 56 which passes through a slot 51 in the frame piece. The ribbed blocks which have been described are all of the same thickness and hence said blocks 43 and 55 form a plurality of suitable shoes or backing members for the strips 4| of emery cloth and aid in keeping said strips in their proper opera- In putting these emery cloth strips in place the short end block 44 of each strip should be put in place last, the adjacent block 43 having previously been mounted in such a position that when the cap screw 46 of the block 44 is screwed down it will cause the beveled face 5| of the projection 50 to bind the block 44 forcibly against the emery cloth end 42 which intervenes between this block and the block 43, thus holding said strip firmly in place with its trailing end portion underlying a block 55, it being understood that the device as viewed in Fig. 3 will be rotated in the clockwise direction.

The aforesaid blocks or shoes 43, 44 and 55 are desirably made of brass, the two blocks 55 being shown of the same size and shape as said blocks 43.

Preparatory to placing the polisher in its operative position the cup-shaped head |8 of the guide bar I1 is placed upon the crank pin extension I6 and is secured thereto by screwing down the set sorew |9. Thereupon, assuming that the polishing and/or abrading elements have previously been mounted within the annular frame which has been described, the tubular portion 1 of the polisher will be telescoped over said guide bar thus bringing the device into its operative relation to the crank pin, as illustrated in Fig. 1. After this has been done the socketted driving member ID of the compressed air motor is applied to the tapered extension 8 and key 9 of the tubular part 1, whereupon said motor is started. It is to be understood that the motor is of a conventional type and is of a light compact structure, which enables the operator manually to move the motor together with the rotating polisher back and forth in the direction of the axis of the crank pin, thereby causing the polishing and/or abrading elements to act upon all parts of the crank pin uniformly until the smoothing and polishing operation has been properly completed. The opeerator can readily watch the progress of the polishing or abraiding operations as the rotating spring arms 2| will not materially obstruct his view of the surface of the crank pin.

It is to be understood that the operator from time to time will apply oil to the polishing and abraiding elements as may be necessary to secure the proper finish to the polishing operation. Also the adjusting nuts 40 will be screwed down to the extent necessary to cause the abraiding or polishing elements to be applied to the surface of the crank pin under the proper pressures. I

The spring action of the resilient arms 2| combined with the action of the cushioning springs 31 causes the annular frame which includes the arcuate frame pieces 22 to expand when said nuts 40 are released. This expansion is necessary, after a polishing operation has been completed, in order to enable the operator to remove the polisher from one crank pin preparatory to placing it upon the next crank pin to be polished.

It should be understood that the present disclosure is for the purposeof illustration 'only and that this invention includes all modifications and equivalents which fall within'the scope of the subject matter claimed. I

What is claimed is: i i I 1. In a crank pin polishing device, a guide bar having a cup-shaped head secured axially to the diametrically contracted end portion of a 1000- motive crank pin, an annular frame including a pair of arcuate members which form diametrically opposite side portions of said frame rotatably and slidably mounted on saidguidebar, the end portions of'said arcuate members-being spaced apart from each otherat each side of said frame, means mountedon said frame to yieldingly ur said spaced apart end portions of said arms toward each other, and polishing meanscarried interiorly by said annular frame.

2. In a crank pin polishing device, an annular frame including a pair of areuate members which form diametrically opposite side portions of said frame, the end portions of said arcuate members being spaced apart from each other at each side of said frame and provided with radially projecta ing ears, yieldable means bridging the spaces between said ears, means mounted on said ears to yieldingly urge said spaced apart end portions of said arcuate members toward each other against the opposition of said yieldable bridging means, polishing means carried interiorly by said annular frame, said polishing means including a strip of polishing material having a detached trailing endportion to contact the crank pin and an end portion securable interiorly to said frame, and means carried by said frame to overlie the trailing portion of said strip against the crank pin.

3. In a crank pin polishing device, an annular frame including a pair of arcuate members which form diametrically opposite side portions of said frame, the end portions of said arcuate members being spaced apart from each other at each side of said frame, bolts extending through said end portions and bridging the spaces between them, a, cushioning spring mounted upon each of said bolts between said spaced apart end portions, another spring mounted upon each-of said bolts to yieldingly urge said spaced apart end portions toward each other in opposition to said cushioning springs, and polishing means carried interiorly by said annular frame.

4. In a crank pin polishing device, an annular frame including a pair of arcuate members which form diametrically opposite side portions of said frame, each of said arcuate members having at each end an apertured ear directed radially outward therefrom, the ears at each side of said frame being spaced apart from each other when the device is in its operative position, a bolt pass ing through the apertures of said spaced apart ears at each side of said frame and bridging the space between them, the head of said bolt engag ing the outer side of one of said ears, the end portion of said bolt opposite to its head projecting through and beyond the other of said ears, a coiled compression spring surrounding the portion of form diametrically opposite side portions of said frame, the end portions of said arcuatemembers being spaced apart from each other at each side of said frame, yielda'ble means to maintain the spaced apart; relation of said end portions by bridging the spacesbetween them, means yieldingly connecting said'spacedapart end portions toeach other at eachside of said frame, means carried interiorly by eachof said arcuate members to detaehably secure an end portion of a strip of abrading material thereto with the remainderof said strip ina position to be trailed over the-surface of the crank pin being polished when the device is in its operative position, a backing member for the trailing portion of 'said's r-ip, said backing member also being carried interiorlyby said arcuate member, and'means to rotationally connect said annular frame'to a driving means in a surrounding relation to a locomotivecrank pin. I

.- 6. The subject matter of claim 5, and "said means for attaching the abraiding strip includtion of said abraiding strip.

ing two abuttable blocks at least one of which is adjustably supported upon the interior face of said a-rcuate member in relation to the other block, and means for releasably securing said one of said ,blocks to said arcuate'member'ina posi tion for gripping between them a deflected por- -7. In a crank pin polishing device, an annular frame including'a pair of arc'uate members which form diametrically opposite side portions thereof, the end portions of said arcuate members being spaced apart fromeach other at opposite sides of. said frame, resilient means carried by said spaced apartend portions to adjustably'maintain them in their spaced apart relation to'each other, each of said arcuate members having a bolt hole through it at substantially its midlength and an arcuate countersink in its convex side around said bolt hole, a plano-convexwasher having its convex face seated in said countersink, means to rotate said frame about its axis, said last recited means carrying a pair of parallel'space'd apart arms each of which extends in an overlying ad- J'acen-t relation to one of'said countersunk bolt holes, a bolt passing through each of said arms,

bolt holes and washers and having a head engag ing'the concave side of the arcuatemember provided therewith, a spring surrounding said bolt and abutting against the outer side of said arm,

of the aforesaid annularframe in relation to said arms by and between which it is supported, and polishing elements mounted upon said annular frame in an interior relation thereto.

8. In a device of the kind described, a guide bar, a cup-shaped head the bottom of which is secured axially to one end of said guide bar with the mouth of the cup located outwardly beyond said end of the bar for securing axially to the diametrically contracted end portion of a locomotive crank pin, a tubular body rotatably and slidably mountable on said guide bar, said body having an axial extension at one end for connection with a manually supportable driving means, a head concentrically fixed to said tubular body at its opposite end, a pairof arms each having an end portion fixed to said head, an annular frame having diametrically opposite side portions one'o'f which is secured to one of said arms and the other of which is secured to the other arm; and crank pin polishing means carried interiorly nular frame. I a

a 9. The subject matter of claim 8, and said arms of said pair being resilient and said annular frame being diametrically expansible to varythe distancebetween itssaid side portions to facilitate the application of said polishing means to and their removal from locomotive crank pins, a piano-convex ball jointring between said annular frame and each of said arms, there being an arcuated countersink formed in the convex side of said frame inwhich the convex side of each of said plano-convex ball joint rings seat, and means for yieldingly securing each said arm and pianoconvex ball joint ring to said frame.-

10. Thesubject matter of claim 8 and, cushioning means interposed andbridging the space betweenthe-end of said diametrically opposite side portions of said annular frame, and resilient means including a bolt and nut construction looselycarried by said end of said diametrically opposite side portions and adjustable to contract the spaces between them varying amounts against the opposition of said cushioning means, the heads of said bolts engaging alternate ends of said opposite side portions 11. In a crank pin polisher, a tubular body, means carried by one end portion of said body bysaidanfor connecting it with a driving means for rotation about its axis, a pair of diametrically opposite, spaced apart arms extending parallel to the axis of said body, means whereby said arms are secured to that end of said tubular body which is opposite to the end thereof which is attachable to said driving means, a frame of an annular character to include within it a crank pin to be polished, means carried by opposite side portions of said frame and located exteriorly thereof to attach said frameto said arms in a position wherein it bridges the space between them, polishing means mounted upon and interiorly of said annular frame, and aball joint connection between said annular frame and each of said arms. 12. In a crank pin polishing device, an annular frame including a pair of arcuate members which form diametrically opposite side portions of said frame, the end portions of said arcuate members being spaced apart from each other at each side of said frame, means yieldingl connecting said spaced apart end portions to each other at each side of said frame, means carried interiorly by each of said arcuate members to detachably secure an end portion of a strip of abrading material thereto with the remainder of said strip in a position to be trailed overthe surface of the crank pin being polished when the device is in its operative position; a backing member for the trailing portion of said strip, said backing member also being carried interiorly by said, arcuate member, means to rotationally connect said annular frame to a driving means ina surrounding relation to a locomotive crank pin, said means for attaching the abrading strip including two abuttable members carried interiorly by said arcuate member at different points valong the length thereof, said arcuate member having an internal projection provided with a bevel and one of said abuttable members consisting of a block which is abuttable against said bevel at one side, and a cap screw projecting throughsaid arcuate member from its convex side and threaded intov said block to draw the latter against said bevel and thus shift the block toward the other member against which it is abuttable to grip a part of the abrading strip i 13. In acrank pin polishing device, an annular frame including a pair of arcuate members which form diametrically opposite side portions of said frame, each of said arcuate members having at each end an apertured ear directed radially outward therefrom, the ears at each side of said frame being spaced apart from each other when the device is in its operative position, a bolt passing loosely through the apertures of said spaced apart ears at each side of said frame and bridging the space between them, the head of said bolt engaging the outer side of alternate ears, the end portion of said bolt opposite to its head projecting through, and beyond the other of said ears, and a coiled compression spring surrounding the portion of said bolt between said ears and serving as a cushion.

14. In a crank pin polishing device, an annular frame including a pair of arcuate members which form diametrically opposite side portions of said frame, the end portions of said arcuate members being spaced apart from each other at each side of said frame, connecting means extending through said end portions and bridging the spaces between them, a cushioning spring mounted upon said connecting means between each of said spaced apart end portions, another spring mounted upon said connecting means to yieldingly urge each of said spaced apart end portions toward each other in opposition to said cushioning springs, and polishing means carried interiorly by said annular frame.

15. In a crank pin polishing device, an annular frame including a pair of arcuate members which form diametrically opposite side portions of said frame, the end portions of said arcuate members beingspaced apart from each other at one side of said frame, connecting means extending through said spaced apart end portions and bridging the space between them, a cushioning spring mounted upon said connecting means between said spaced apart end portions, another spring mounted, upon said connecting means to yieldingly urge said spaced apart endportions towardeach other-in opposition to said cushioning spring, meansconnecting the end portions of said arcuate memberson the side thereof which is opposite said connecting means, and polishing means carried interiorly by said annular frame.

16. In a crank pin polishing device, an annularframe including a pair of arcuate members which form diametrically opposite side portions of saidframe, each of said arcuate members having at each end an apertured ear directed radially outward therefrom, the ears at each sideof said frame being spaced apart from each other when the device is in its operative position, a boltpassing through the apertures of said spaced apart ears at each side of said frame and bridging the space between them, the head of said bolt engaging the outer side of one of said ears, the end portion of said bolt opposite to its head projecting through and beyond the otherof said ears, a coiled compression spring'surrounding the portion of said bolt between said ears and serving as a cushion, and a coil spring surrounding that portion of said bolt which projectsbeyond the other of said ears.

' -1'7. -I n a crank pin polishing device, an annular frame including a pair of arcuate members which form diametrically opposite side portions of said frame, eachofsaid arcuate members having at each end an apertured ear directed radially outward therefrom, the cars at each side of said frame being spaced apart from each other when the device is in its operative position, a bolt passing through the apertures of said spaced apart ears at each side of said frame and bridging the space between them, the head of said bolt engaging the outer side of one of said ears, the end portion of said bolt opposite to its head projecting through and beyond the other of said ears, a coiled compression spring surrounding the portion of said bolt between said ears and serving as a cushion, a coil spring surrounding that portion of said bolt which projects beyond the other of said ears, a nut screwing onto said bolt beyond the latter spring to regulate the tension thereof in opposition to said cushioning spring, and means to connect said annular frame with a driving means for rotation about its axis.

18. In a crank pin polishing device, an annular frame including a pair of arcuate members which form diametrically opposite side portions of said frame, each of said arcuate members having at each end an apertured ear directed radially outward therefrom, the ears at each side of said frame being spaced apart from each other when the device is in its operative position, a bolt passing through the apertures of said spaced apart cars at each side of said frame and bridging the space between them, the head of said bolt engaging the outer side of one of said ears, the end portion of said bolt opposite to its head projecting through and beyond the other of said ears, a coiled compression spring surrounding the portion of said bolt between said ears and serving as a cushion, a 1001]. spring surrounding that portion of said bolt which projects beyond the other of said ears, and a nut screwing onto said bolt beyond the latter spring to regulate the tension thereof in opposition to said cushioning spring.

19. In a crank pin polishing device, an annular frame including a pair of arcuate members which form diametrically opposite side portions of said frame, the end portions of said arcuate members being spaced apart from each other at each side of said frame, connecting means extending through said end portions and bridging the spaces between them, a cushioning spring mounted upon said connecting means between each of said spaced apart end portions, another spring mounted upon said connecting means at one side of said frame to yieldingly urge said spaced apart end portions at that side of the frame toward each other in opposition to its cushioning spring, and polishing means carried interiorly by said annular frame;

20. The subject matter of claim 14, and said second said springs being mounted upon the outer, alternate faces of said spaced apart and portions.

21. The subject matter of claim 4, and the bolt at one side of said frame being directed upwardly and the bolt at the opposite of said frame being directed downwardly.

HENRY E. KLINGLESMITH. 

